Molding-flask.



H. E. THOMPSON.

MOLDING FLASK.

APPLICATION FILED NOV. 16, 1911.

1,1 04,085. Patented July 21, 1914.

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' ATTORN EY H. E. THOMPSON.

MOLDING PLASK.

APPLICATION FILED 11017.16, 1911.

1,104,085. Patented July 21, 1914.

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INVENTOR ATTORN 7 WMM THOMPSON.

LDING FLA AP ATION FILED N0 1911. v 1 1 04,085 Patented July- 21,

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I ma NEY mar HENRY E. THOMPSON, or NEWARK, new JERSEY, ASSIGNOR or rnnnn-froonrrrs'ro PERCY L. GALLAGHER, OF VERONA, NEW JERSEY, AND ONE-FOURTH TO JOSEPH D.

GALLAGHER, OF GLEN. RIDGE, NEW JERSEY.

MOLDINGFLASK.

Specification of Letters Patent. PatentedJuly 21, 1914.

Application filed November 16, 1911. Serial No. 660,569.

. 0 all whom. it may concern:

Be it known that I, HENRY E. THOMP SON, a citizen of the United States, residing at Newark, New Jersey, have invented certain new and useful Improvements in Molding-Flasks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

In producing various cast iron articles, particularly where thin walls or other parts are to be cast, much time has been hitherto lost in the process of peening, whereby the warping of the parts is corrected after the articles aretaken out of the mold. In many cases the warping, due to unavoidable irregularities in the rate of cooling within the mold, is too serious for correction, and this feature is one of the most annoying obstacles to the easy production of well formed and sound iron castings.

It is the object of my present invention to provide a method of support for castings while in the sand, and a device for carrying I out the same, whereby warping may be prevented rather than corrected, and whereby means are provided for resisting the warping tendency during cooling.

By the practice of my present invention all the waste of time and labor incident to the peening process is avoided, and sound and perfect castings are produced in the first instance.

In the practice of my invention the flask is provided with stout abutments making contact with the two sides of the casting or part thereof while the same is cooling in the sand. These abutments, which are preferably made easily adjustable to suit different casting, are so firmly supported as to resist successfully any tendency to warp which the casting may develop during its period improved flask, Fig. 2 is a partial perspective view of the same showing the means for insuring accurate adjustment of the two parts of the flask to each other, Fig. 3 is "a sectional View of the drag applied to the pattern on the molding board, Fig. 4 is a sectional view of the flask, pattern and sand as assembled in forming the mold, Fig. 5 is a view partly in elevation and partly in section showing the casting within the closed flask, Fig. 6 is a complete sectional view of the same, showing a modified form of flask, and F ig. 7 is an enlarged sectional view of a preferred form of movable and adjustable abutment.

My invention is adaptable to flasks of a great variety of shapes and forms, and 1 have shown in my drawings two of such forms, wherein the drag and cope are each formed with a gridiron back composed, for instance of bars 10. and bars 11 at right angles thereto. These bars form a very convenient attachment whereby the movable abutments may be located in a great variety of arrangements corresponding to an indefinite number of kinds of patterns.

The construction of the abutments may be greatly varied without departing from my invention, and I have shown three illustrative forms thereof in my drawings.

In Fig. 8, the abutments consist of thread ed pins 12, passing through and engaging threaded holes which may be provided at any desired points on the flask. By screwing these pins in more or less, the point of engagement of each with the casting may be used to more firmly secure each pin in place.

In this figure the drag is shown supplied with abutments of this kind. It'is within my invention to apply abutments of this character to any portion of a mold or flask.

In Figs-1. 4t, 5, 6 and 7 I have shown another form of abutment applied to the cope. This abutment consists of a pin 14 having a screw threaded engagement with a divided base 15 adapted to fit and straddle the bars 10 and 11 of the gridiron back in any position found convenient in any given case. Setscrews 16 serve to secure the abutments after proper adjustment to make contact with the pattern; and, in order to make each abutment absolutely firm against warping pressure, a wedge 17 may be inserted under each pin, within the space between it and the bar 10 or 11 which carries it.

The mode of use of my device is illustrated in Figs. 2, 3 and 4.. First the pattern, exemplified at 18 in Fig. 3, is placed upon a molding board. The drag is then placed over it in a well known way, being firmly fixed by swinging bolts 19, or the like, engaging the board and drag. The abutments 12 are then adjusted by being screwed down until they make firm contact with the pattern. With the various parts in this position the drag is filled with sand which is suitably tamped down. The drag being then released and turned upside down while sus pended on the knobs 20, the cope is applied to it in the position shown in Fig. 4:. Ac curate registry of the two parts of the flask is secured by the use of suitable projections 21 on one portion of the flask which enter and fit suitable sockets 22 in the other portion. (See Fig. 2.) During this part of the proceeding, I prefer to employ separators 23, whereby the two parts of the flask are kept slightly separated during packing of the sand. By removing these when the pattern is removed, and closlng the mold, the sand surfaces are squeezed together in a manner which prevents formation of any spaces whereby fins are formed. The separators 23 may have a variety of forms, and I have shown simple bent plates straddling the edges of the flask. The cope and drag having been united by the swinging bolts 19 in the manner shown in Fig. 4, and the pattern 18 being in place, the set screws 16 are loosened and the pins 14 are pressed into firm contact with the back of the pattern. The set screws 16 are then tightened and, if occasion require, the wedges 17 are driven into place. The sand is then packed into the cope. The next step is to open the mold and remove the pattern and separators. The mold is then closed and the iron poured, when the mold and casting will take the position shown in Figs. 5 and 6. It will be seen that the casting will be firmly confined at suitable points by strongly resisting abutments, whereby the tendency to warp will be successfully opposed. In the form of flask shown in Fig. 6, both the cope and drag are provided with straddling abutments.

My improvement is capable of e1nbodiment in a great variety of modified forms, and I do not limit myself to the details herein shown and described, save as specifically set forth in my respective claims.

What I claim is- 1. A molding flask comprising a plurality of abutments adjustably and removably secured to said flask said abutments being provided with independent adjustable contact points adapted to constrain the casting within said flask.

2. A molding flask provided with supporting bars, abutments adjustably secured to said bars and provided with adjustable contact points adapted to constrain the casting within said flask.

3. A molding flask provided with supporting bars, abutments having bifurcated outer ends for straddling said bars and adjustable contact points at the inner ends adapted to constrain the casting within said flask, and means for adjustably securing the bifurcated ends of the abutments to said bars.

4. In an improved molding flask, supporting bars and abutments comprising pins and divided bases straddling said bars, said pins being threaded into said bases, substantially as described.

5. In an improved molding flask, supporting bars, abutments straddling said bars and wedges under said abutments, substantially as described.

6. In an improved molding flask, sup porting bars, abutments straddling said bars, set screws on said abutments, and wedges under said abutments, substantially as described.

7. In an improved molding flask, confining abutments comprising pins having screw threaded engagements with the sides of said flask, substantially as described.

In testimony whereof, I {l'fliX my signature, in presence of two witnesses.

HENRY E. THOMPSON.

Witnesses:

H. S. MacKArn, KATH RINE C. MEAD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, I). C. 

